Mathematica issue with definite integrals

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SUMMARY

The forum discussion centers on resolving an issue with definite integrals in Mathematica 6.030. The user attempted to evaluate the integral of the function \(((2A)(E^{-d((m x^2)/h)})^2\) from 0 to infinity but received an unexpected result that included the variable \(x\). The solution was clarified by suggesting the correct use of the DIntegrate function for definite integration, which resolved the user's confusion.

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Homework Statement



I'm trying to evaluate the problem below but the Mathematica gives me is in terms of x. Can someone please help me solve this thing.

Homework Equations



Integrate[((2*A)(E^(-d*((m*x^2)/h) ) ) )^2,x,{x,0,Infinity} ]

The Attempt at a Solution



The solution Mathematica gives me is (a^2 Sqrt[2 \[Pi]] x)/Sqrt[(d m)/h]
Why is there an "x" in the solution at all?
I'm using Mathematica 6.030
 
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u want to solving a definite integral where x varies from 0 to infinity...

i think the function for definite integration is DIntegrate. integrate just gives u indefinite integration
 
This is how the input should look. Putting an x after the expression tells it to antidifferentiate.

Code:
Integrate[((2*A)(E^(-d*((m*x^2)/h) ) ) )^2,{x,0,Infinity}]
 
@qntty Thanks it worked!
 

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